SEATTLE (AP) — Ashes to ashes, guts to dirt.

Gov. Jay Inslee signed legislation Tuesday making Washington the first state to approve composting as an alternative to burying or cremating human remains.

It allows licensed facilities to offer “natural organic reduction,” which turns a body, mixed with substances such as wood chips and straw, into about two wheelbarrows’ worth of soil in a span of several weeks.

Loved ones are allowed to keep the soil to spread, just as they might spread the ashes of someone who has been cremated — or even use it to plant vegetables or a tree.

“It gives meaning and use to what happens to our bodies after death,” said Nora Menkin, executive director of the Seattle-based People’s Memorial Association, which helps people plan for funerals.

Supporters say the method is an environmentally friendly alternative to cremation, which releases carbon dioxide and particulates into the air, and conventional burial, in which people are drained of their blood, pumped full of formaldehyde and other chemicals that can pollute groundwater, and placed in a nearly indestructible coffin, taking up land.

“That’s a serious weight on the earth and the environment as your final farewell,” said Sen. Jamie Pedersen, the Seattle Democrat who sponsored the measure.